/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/Operations/MeshPlaneCut.h
Compute the plane cut by splitting mesh edges that cross the cut plane, and then optionally update groups
true if operation succeeds
virtual bool SplitEdgesOnly ( bool bAssignNewGroups, [TSet](API\Runtime\Core\Containers\TSet)< int32 > * OptionalTriangleSelection )